Cannot change drive letter of partition

I have 2 partitions both 30GB on the same HD. 1 was created at the time i installed XP and as usual this was the C: drive. I created a 2nd partition to store data etc etc and this was the E: drive.
Today i deleted my C: drive from the windows setup screen, and installed XP to a new 30GB partition again with the drive letter of C:
Unexpectedly windows at this point listed the E: drive as H:, didnt think it would be a problem as i thought i could change this later in MMC.
However when i try and change this drive letter from H: back to E: i get the following message;
'windows cannot modify the drive letter of your system volume or boot volume'

Now this is the system volume and the NTDLR file exists on ths drive, is there anyway i can move this or change this partition so i can change the drive letter back to E:? I have several programs that all use E:\APPDATA as its path and dont want to have to spend ages changing all this.

It sounds like when you reinstalled windows it put NTLDR on you data partition (E:) but installed windows on the C: drive. Try renaming NTLDR to ZZZNTLDR to prevent it from being seen. After rebooting you will get a message saying "NTLDR is missing or corupt". That's ok, reboot the pc to you windows cd and follow these instructions:

.Insert the Windows XP CD-ROM into the CD-ROM drive, and then restart the computer.

Click to select any options that are required to start the computer from the CD-ROM drive if you are prompted.

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